Not sure what year model h3 you have. But at gmpartscenter.net it states that pn is for
3.7L, 1st design. Hummer H3.
You may need the second design
(25964059)
Hummer H3. From 9/30/08. Canyon, Colorado. 5.3l. 5.3L, 2nd design. 3.7L, 2nd design. 3.5 & 3.7L. Removes harmful moisture from the A/C...
As dry a it is out here. You could get away with removing the old freon. Disconnect and immediately plug the lines. Then install the new valve and recharge the system. Trick is to limit as much as possible how much moisture and atmosphere that is able to enter the system.
I've done it on an...
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